【Various Sizes】There are 7 most common sizes, M3/M4/M5/M6/M8/M10/M12, to meet your daily needs. 【Excellent Material】65Mn metal steel, high quality, extremely strong, corrosion resistant and durable. 【Locking Effect】The locking washer applies a spring force between the head and the base plate to fix the hard washer to the thread of the hard bolt in front of the base plate, thereby increasing friction and rotation resistance. 【Wide Application】Widely used in mechanical equipment, electronic equipment, household appliances and other fields, suitable for craftsmen, professionals, industry, artisans and decoration. 【Classified Storage】Each size is divided into a storage box for easy access and storage.